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Computer Security Basics
Keep security software up to date and make sure patches are in place. Use a two-way firewall, not just a one way. Avoid opening attachments from unknown sources and avoid rogue security products that appear as pop ups and claim they will repair you computer for a fee. If you use Internet Explorer go to Microsoft Windows Update to install the latest safety patches. Do the same for Firefox, Chrome, Opera, Maxthon, SeaMonkey, Camino and Safari. While there you should choose the automatic download option for your particular browser.
To sum it up: Be cautious about all communications; thinking before you click. Do not open email or related attachments from untrusted sources. Use and regularly update firewalls, antivirus, and antispyware programs. Properly configure and patch operating systems, browsers, and other software programs.

More Computer Security Guidance
Do Not do financial transactions on public computers. If you are working on your laptop in a public place make sure no one is looking over your shoulder. Change your passwords using combinations of letters, numbers and symbols or make it a pass phrase. Be wary of false promises, free downloads, free offers all designed to take your identity or hack your computer.
Annoyed by pop up browser windows You click cancel and the pop up returns, what to do? Try this; click Alt - F4 and it should close the browser, or you can close it though task manager by clicking alt-ctr-del then click applications and then highlight the application you want to end and click end task.

The following Red Flags will help protect you from Online Fraud.
When doing business with on line sites such as Ebay, avoid purchases when the seller: Is not located in the Unites States. Doesn't offer PayPal or similar payment options. Has no photo or information on their business homepage. Requests that the money be sent outside the United States. Only accepts wire transfers, money orders or cash transactions. Requires the buyer to call or email them before or after bidding on an item. Has excessive negative ratings from their Business Network. Always read a seller's ratings. Contact information is vague or contact information is only provided after winning an auction.